If you dream of seeing someone's bare back, this signals a weakening of your personal power or influence. Be cautious about offering financial help or guidance to others right now — what seems generous may leave you vulnerable. This image can also carry an undercurrent of physical unease.
If you watch someone turn their back and walk away from you in a dream, take it as a warning: there are people in your waking life whose envy or jealousy is quietly working against your interests.
If it is your own back you dream of, the symbolism turns inward — something behind you, out of your line of sight, deserves your attention.